SundanceEventDetector.cpp

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// ************************************************************************
// 
//                              Sundance
//                 Copyright (2005) Sandia Corporation
// 
// Copyright (year first published) Sandia Corporation.  Under the terms 
// of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government 
// retains certain rights in this software.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//                                                                                 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA                                                                                
// Questions? Contact Kevin Long (krlong@sandia.gov), 
// Sandia National Laboratories, Livermore, California, USA
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#include "SundanceEventDetector.hpp"
#include "SundanceDiscreteFunction.hpp"
#include "PlayaOut.hpp"
#include "PlayaTabs.hpp"

namespace Sundance
{

bool ThresholdEventDetector::checkForEvent(
  const double& t1, const Expr& u1,
  const double& t2, const Expr& u2) 
{
  if (foundEvent()) return false;

  Vector<double> x1 = getDiscreteFunctionVector(u1);
  Vector<double> x2 = getDiscreteFunctionVector(u2);

  if (eventType_==AllAbove || eventType_==AnyBelow)
  {
    double a1 = x1.min()-threshold_;
    double a2 = x2.min()-threshold_;
    if (a1*a2 <= 0) 
    {
      double t = t1 - a1*(t2-t1)/(a2-a1);
      eventTime_ = t;
      gotIt_ = true;
      return true;
    }
  }
  else
  {
    double a1 = x1.max()-threshold_;
    double a2 = x2.max()-threshold_;
    if (a1*a2 <= 0) 
    {
      double t = t1 - a1*(t2-t1)/(a2-a1);
      eventTime_ = t;
      gotIt_ = true;
      return true;
    }
  }
  return false;
}

}